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1 /* | |
2 * Copyright (C) 2013 Adobe Systems Inc. All rights reserved. | |
3 * Copyright (C) 2013 Google Inc. All rights reserved. | |
4 * Copyright (C) 2011 Apple Inc. All rights reserved. | |
5 * | |
6 * Redistribution and use in source and binary forms, with or without | |
7 * modification, are permitted provided that the following conditions | |
8 * are met: | |
9 * 1. Redistributions of source code must retain the above copyright | |
10 * notice, this list of conditions and the following disclaimer. | |
11 * 2. Redistributions in binary form must reproduce the above copyright | |
12 * notice, this list of conditions and the following disclaimer in the | |
13 * documentation and/or other materials provided with the distribution. | |
14 * | |
15 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 */ | |
27 | |
28 #include "core/layout/svg/ReferenceFilterBuilder.h" | |
29 | |
30 #include "core/dom/Element.h" | |
31 #include "core/fetch/DocumentResource.h" | |
32 #include "core/style/FilterOperation.h" | |
33 #include "core/svg/SVGDocumentExtensions.h" | |
34 #include "core/svg/SVGFilterElement.h" | |
35 | |
36 namespace blink { | |
37 | |
38 namespace { | |
39 | |
40 using ResourceReferenceMap = | |
41 PersistentHeapHashMap<WeakMember<const FilterOperation>, | |
42 Member<DocumentResourceReference>>; | |
43 | |
44 ResourceReferenceMap& documentResourceReferences() { | |
45 DEFINE_STATIC_LOCAL(ResourceReferenceMap, documentResourceReferences, ()); | |
46 return documentResourceReferences; | |
47 } | |
48 | |
49 } // namespace | |
50 | |
51 DocumentResourceReference* ReferenceFilterBuilder::documentResourceReference( | |
52 const FilterOperation* filterOperation) { | |
53 return documentResourceReferences().get(filterOperation); | |
54 } | |
55 | |
56 void ReferenceFilterBuilder::setDocumentResourceReference( | |
57 const FilterOperation* filterOperation, | |
58 DocumentResourceReference* documentResourceReference) { | |
59 ASSERT(!documentResourceReferences().contains(filterOperation)); | |
60 documentResourceReferences().add(filterOperation, documentResourceReference); | |
61 } | |
62 | |
63 SVGFilterElement* ReferenceFilterBuilder::resolveFilterReference( | |
64 const ReferenceFilterOperation& filterOperation, | |
65 Element& element) { | |
66 TreeScope* treeScope = &element.treeScope(); | |
67 | |
68 if (DocumentResourceReference* documentResourceRef = | |
69 documentResourceReference(&filterOperation)) { | |
70 // If we have an SVG document, this is an external reference. Otherwise | |
71 // we look up the referenced node in the current document. | |
72 if (DocumentResource* cachedSVGDocument = documentResourceRef->document()) | |
73 treeScope = cachedSVGDocument->document(); | |
74 } | |
75 | |
76 if (!treeScope) | |
77 return nullptr; | |
78 | |
79 Element* filter = treeScope->getElementById(filterOperation.fragment()); | |
80 | |
81 if (!filter) { | |
82 // Although we did not find the referenced filter, it might exist later | |
83 // in the document. | |
84 treeScope->document().accessSVGExtensions().addPendingResource( | |
85 filterOperation.fragment(), &element); | |
86 return nullptr; | |
87 } | |
88 | |
89 if (!isSVGFilterElement(*filter)) | |
90 return nullptr; | |
91 | |
92 return toSVGFilterElement(filter); | |
93 } | |
94 | |
95 } // namespace blink | |
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